On 16 Jul, 12:42, wrote:
On 16 Jul, 10:20, "TMC" wrote:



wrote in message

ups.com...

Hi

I'm considering laying a limecrete patio slab. I'm considering it for
2 reasons:

1. I have neither a damp proof course nor damp proof membrane in my
house, and I'm concerned that a concrete slab next to it might cause
some damp.

2. Sometime in the future, I may be able to afford a little
conservatory on it, so I might as wall do the slab now while I'm
working on the patio anyway.

I'd rather not risk causing damp, but I'd also rather not risk the
slab not setting. I may end up putting a very small amount of cement
in the otherwise 6 ballast to 1 hydrated lime mix.

Any thoughts?

T

Never even looked at limecrete before so Googled out of interest

I was not even considering replying to your post

However Google turned this uphttp://www.oldhousestore.co.uk/tech_ohs/limecrete.html

which I thought may be of interest

Tony

Thanks for the link. Unfortunately they did not test the cheap stuff,
ie. bagged hydrated lime. I have experimented a bit with it in mortar
form, and it seems to go off eventually. I'm also not bothered how
hard the limecrete sets - so long as it doesn't break up.

I suppose an alternative would be to leave a reasonable gap between a
concrete slab and the house, and fill it with pea shingle or
something.

T

That's because the cheap stuff is rubbish. Bagged hydrated lime
generally contains a significant amount of already calcified material
which will affect the final quality. If you really want to do it in
lime based stuff then it's no good seeing it as the cheap option. What
leads you to think that a slab of concrete next to the house will
cause a damp problem anyway?
Either use some proper lime stuff, or stick to concrete.

Fash